| 1 | /* Destroy a semaphore. Generic version. |
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| 2 | Copyright (C) 2005-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <semaphore.h> |
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| 20 | #include <errno.h> |
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| 21 | |
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| 22 | #include <pt-internal.h> |
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| 23 | |
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| 24 | int |
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| 25 | __sem_destroy (sem_t *sem) |
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| 26 | { |
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| 27 | struct new_sem *isem = (struct new_sem *) sem; |
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| 28 | if ( |
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| 29 | #if __HAVE_64B_ATOMICS |
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| 30 | atomic_load_relaxed (&isem->data) >> SEM_NWAITERS_SHIFT |
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| 31 | #else |
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| 32 | atomic_load_relaxed (&isem->value) & SEM_NWAITERS_MASK |
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| 33 | || isem->nwaiters |
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| 34 | #endif |
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| 35 | ) |
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| 36 | /* There are threads waiting on *SEM. */ |
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| 37 | { |
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| 38 | errno = EBUSY; |
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| 39 | return -1; |
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| 40 | } |
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| 41 | |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |
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| 45 | strong_alias (__sem_destroy, sem_destroy); |
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| 46 | |
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